Preface (J. Gottsmann, J. Martí). 1. Residence times of silicic magmas associated with calderas (F. Costa). 2. Sedimentology, depositional mechanisms and pulsating behaviour of pyroclastic density currents (R. Sulpizio, P. Dellino). 3. The use of lithic clast distributions in pyroclastic deposits to understand pre- and syn-caldera collapse processes; a case study of the Abrigo Ignimbrite, Tenerife, Canary Islands (A. Pittari, et al). 4. The Ignimbrite Flare-up and graben-calderas of the Sierra Madre Occidental, Mexico (G. J. Aguirre-Díaz et al). 5. Characterisation of Archean subaqueous calderas in Canada: physical volcanology, carbonate-rich hydrothermal alteration and a new exploration model (W. U. Mueller et al). 6. A review on collapse caldera modelling (J. Martí et al). 7. Structural development of calderas: a synthesis from analogue experiments (V. Acocella). 8. Magma-chamber geometry, fluid transport, local stresses, and rock behaviour during collapse-caldera formation (A. Gudmundsson). 9. Facilitating dyke intrusions into ring-faults (T. R. Walter). 10. A new uplift episode at Campi Flegrei caldera (Southern Italy): implications for unrest interpretation and eruption hazard evaluation (C. Troise et al). 11. Hydrothermal fluid circulation and its effect on caldera unrest (M. Todesco). 12. Deciphering causes of unrest at explosive collapse calderas: Recent advances and future challenges of joint time-lapse gravimetric and ground deformation studies (J. Gottsmann, M. Battaglia). 13. The failure forecast method: review and application for the real-time detection of precursory patterns at reawakening volcanoes (M. Tárraga et al). 14. Perspectives on the application of the geostatistical approach to volcano forecasting at different time scales (R. Carniel, O. Jaquet, M. Tárraga).